ChemInform Abstract: POLYMETHINE DYES ‐ DERIVATIVES OF NAPHTHO(2,3‐D)IMIDAZOLE

Abstract

Das 2,3‐Diamino‐ naphthalinderivat (I) cyclisiert mit Acetylchlorid (II) zum lß‐Diphenyl‐2‐methylnaphtho‐[2,3‐d]‐imidazoliumchlorid (III) aus dem mit NaI das Iodid (IV) entsteht.

Fluorescent J-aggregates of cyanine dyes: basic research and applications review

“…Various chemical methodologies were applied for increasing the L-parameter, which enable shifting the dyes absorption to the near-IR region, such as benzannelation of heterocycles used as TG [91][92][93], using of non-alternated hydrocarbons [94,95] and their heteroanalogues (2-azaazulene or pseudoazulene, such as indeno[2,1-b]chromene) [96,97] and the introduction of π-donor substituents (OCH 3 , N(CH 3 ) 2 ) to sensitive positions of TG [98,99]. Such spectral response to the TGs chemical modification provides possibility to create the near-IR dye, which could absorb light at ∼1000 nm, with the variation of relatively short polymethine chain (figure 6).…”

Rational Design of Near-Infrared-II Organic Molecular Dyes for Bioimaging and Biosensing

“…For example, the absorption wavelength of Cy5 and compound 16 bathochromically shifted about 20 nm to form Cy5.5 (from 655 to 676 nm) and compound 17 (from 616 to 640 nm), respectively, after annulation at the terminal groups (Figure ). , …”

“…For example, the absorption wavelength of Cy5 and compound 16 bathochromically shifted about 20 nm to form Cy5.5 (from 655 to 676 nm) and compound 17 (from 616 to 640 nm), respectively, after annulation at the terminal groups (Figure 5). 87,88 The absorption of different polymethine dyes with the same conjugated chain length depends appreciably on the topology of the chemical structure of terminal groups (Figure 6). 69,89−93 Different terminal groups hold various electron withdrawing or donating ability, which determines the charge transfer ability between donor and acceptor in the molecular structure and influences the spectral properties.…”